"C.H.Ling" wrote:
>
>
> I think you can never break the magic formula in 35mm film system:
>
> Front lens diameter/focal length=largest aperture of the lens.
>
> e.g. if you want the 100/2 become a 170mm/2 you need at least 85mm
> diameter front element. I think the B300 is smaller than 85mm.
>
Sorry for the typo, it should be:
Focal length/aperture = minimum front lens diameter
C.H.Ling
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